Electric-arc lamp.



No. 635,85I. Patented Oct. 3|, I899.

c. E. HABTHAN.

ELECTBlC ARC LAMP.

(Applicution filed. Apr. 23, 1898.) fl J 2 Sheets-Sh0at l.

FE! l l WITNELEJEIEE- INVENTEIR- man/ w N0. 635,85I. Patented Oct. 3|,I899.

C. E. HABTHAN.

ELECTRIC ARC LAMP.

(Applicltion filed Apr. 28, 1898.)

2 Sheets-Sheet 2.

- (Ila Model.)

[TE-Z.

INVILNTEH'L MEM maxi M as 20., morouT UNITED STATES PATENT CFFIcE.

CHARLES E. HARTHAN, OE LYNN, MASSACHUSETTS, ASSIGNOR TO THE GENERALELECTRIC COMPANY, OF NEXV YORK.

ELECTRIC-ARC LAM P.

SPECIFICATION forming part of Letters Patent N 0. 635,851 dated October31, 1899.

Application filed A ri123, 1898. Serial No. 678,549. (No model.)

arc Will be positively established and auto-' matically regulated duringthe operation of thelamp, and comprises certain combinations of parts,all of which will hereinafter be particularly pointed out and distinctlyclaimed.

In the accompanying drawings, Figure l is a view in elevation of thearc-governing mechanism. Fig. 2 is a side view taken at right angles tothat in Fig. 1. Fig. 3 is adiagram illustrating the circuits of thelamp.

The carbon-regulating mechanism is mounted on a frame A, having at itsbottom the centrally-located raised base portion B, with the tubularpassage-way b. At the top of the frame A is a corresponding tubularpassageway a. The carbon feed through the passage-ways a and Z).Suspended from the top of the frame A are the serieswhich the cores aremounted. Depending I from the frame A and on the opposite sides of thecarbon-feed red are lugs c. Pivoted to these lugs is a lever F, havingan open central portion surrounding the carbon-feed rod, the pivotalconnection being made at opposite 1 sides of the central opening.

A link G is pivoted at one end between ears f on one end of the lever Fand at the other end between ears g, fixed to the upper side of thecross-barE between its ends. The crossbar D is similarly connected withthe opposite end of the leverF by link H. The upper end of the link H ispivoted within a slot in the rod 0 extends The series magnets ency, adash-pot N is operatively connected end of the lever F, while its lowerend is pivoted to cars h on the cross-bar D.

A lever K, having a bifurcated end 7t, is pivoted to theclutch-supporting sleeve L. The other end of the lever K is connected bya link M to depending lugs i on the frame A. The levers F and K areprovided with elongated slots and are connected by a link I, hav ing itsends pivoted in the slots. The link H, above referred to, passes freelythrough the slot within which the lower end of the link I is pivoted.

In order that the series magnets D shall always be in condition tostrike the are when the lamp is not energized, itis necessary that thecore of the magnet be withdrawn when no current is passing. In theconstruction shown this objectis effected by the downward pull on thelink I due to the weights supported thereby. To equalize the pullexertedby the magnets D on its core D, a compensating spring S is adjustablyconnected at s to the base of the frame A and at the other end isconnected to an arm H, projecting from the link H.

Since the series and shunt magnets act in opposition to each other inmoving the carhon-feeding rod, any substantial variation in the currentthrough or difference of potential of the arc has a tendency to cause areciprocation of the feeding-rod, known as pumping, the same being dueto the inertia of the reciprocating parts. To overcome this tendto thefeeding mechanism, which dash-pot has its cylinder pivoted to an arm G,extending from the link G. The plunger of the dashpot is fixed to thebase of the frame A at '12..

The clutch mechanism consists of a hollow cylinder or sleeve L, havingan inturned upper edge loosely surrounding the carbon-feeding rod. Theinturned edge is indicated in Fig. l by dotted lines. Extending fromopposite sides of the cylinder L are ears 0 with drooping ends. Each ofthese ears has a pivot 12, which engages a slot in one end of abellcranklever P, which lever is extended around so as to clear thefeeding-rod C and is fulcrumed at 0 in an open frame Q. The frame Q, hasan oblong opening therein surrounding the carbon rod and the grip-shoesJ and at either end a lug It, slidably engaging the reduced upperportion T of posts U, fixed to the base of, the frame A. The other armsV of the bell-crank levers are pivoted to gripshoes J.

On the under side of the cross-bar D is an insulated contact-block X forclosing the circuit between the terminals Y and Z. The circuit is closedonly when the core of the magnet D is in its lowest position.

A diagram of the circuits of the lamp is shown in Fig. 3. The currententering at :1: passes through the steadying resistance as and thenduring the normal operation of the lamp through the series coil D. Thecurrent then divides, the major portion passing through the are andthence to the negative terminal 1 of the lamp, while the other componentof the current passes through the coil E in shunt to the arc and then tothe negative terminal. A resistance y is connected in a normallyopenshunt-circuit about the coils D and E.

A device for short-eircuiting any number of spires of the coiledresistance 0; for purposes of adjustment is conventionally representedat The operation of the lamp is as follows: Upon closing the switch Sthe current passes through the series coil D, which attracts its core d.The motion of the core is then transmitted through the links H and I tothe lever K, which then acts to lift the cylinder L. The pivot-pins 19,carried by the cylinder L, then act on the bell-crank levers P to turnthem about their fulcruins 0', thus causing the grip-shoes J to bite thefeeding-rod C. A further upward movement of the sleeve L raises thefeeding-rod and so springs the are, the difference of potential of whichresults in energizing the shunt-coils E. These coils attracting theircores 6 act through the link G and lever F in opposition to any upwardmovement of the feeding-rod. The force of attraction of the coils Eincreases with the length of the are, and the mechanism is soproportioned and adjusted as to reach a condition of balance when thedesired length of are has been attained. Upon opening the switch S theare is extinguished, the armature D of the series magnet falls, and theinsulated contact-point X bridges the contacts I Z, thus shunting theresistance y about the actuating-coils E and D.

What I claim as new, and desire to secure by Letters Patent of theUnited States, is

1. In an electric-are lamp, a frame, two sets of magnets pendenttherefrom, movable cores for said magnets, a lever fulcrumed to theframe and connected by links with said cores, a second lever inoperative relation to the first lever, a link for connecting one end ofthe second lever with the frame, a clutch carried by said last-mentionedlever, and a feeding-rod actuated by said clutch.

2. In an electric-arc lamp the combination of a rod, a sleeve looselysurrounding such rod, ears extending from said sleeve, verti-Cally-extending guide-rods with reduced upper ends, an open frameslidably mounted on said guide-rods, bell-crank levers fulcrumed in saidframe, a grip-shoe carried by one arm of each bell-crank lever, and asliding connection between the other arm of each bellcrank lever and oneof said ears.

8. In an electric-arc lamp, the combination of a frame, guide-rodsextending upwardly therefrom, a frame-piece movable on said guide-rods,a sleeve, bell-crank levers pivoted to said frame-piece and having oneset of arms pivoted to said sleeve, and grip-shoes carried by the-otherarms.

4. In an electric-arc lamp, the combination of a frame, a forked leverhaving a link connection with said frame, a sleeve carried by saidforked lever, ears extending from said sleeve, a frame-piece, bell-cranklevers fulcrumed in said frame-piece, a grip-shoe carried by one arm ofeach bell-crank lever, and a connection between the other arm of eachbell-crank lever and one of said ears, and means for actuating saidforked lever.

5. In an electric-arc lamp the combination of a sleeve pivotallyconnected to a floating lever, ears extending therefrom, bell-cranklevers having a loose connection with said ears and fulcrumed in aframe-piece, and grip-shoes carried by said levers.

6. In an eleetric-arclamp, the combination of a frame, two sets ofmagnets fixed thereto, movable cores for said magnets, a lever fulcrumedto the frame and connected by links with said cores, a second lover, alink, for connecting one end of the second lever with the frame, a linkconnecting said levers, a carbon-feeding rod, a sleeve looselysurrounding said rod, and a pivotal connection between the sleeve andsaidsecond lever.

7. In an electric-arclamp,the combination of aframe, two sets of magnetspendent therefrom, movable cores for said magnets, a lever fulcrumed tothe frame and connected by links with said cores, arms extending fromeach link, a dash-pot connected to one arm and a spring acting on theother.

In witness whereof I have hereunto set my hand this 20th day of April,1898.

CHARLES E. IIARTIIAN.

\Vitnesses:

H. P. Cnosnv, D'UGALD MoKInLor.

